Hybrid electric vehicles are a new generation of new energy vehicles that are powered by traditional internal combustion engines and electric motors. They have the advantages of low emissions, low fuel consumption and high power output. According to the power ratio of the motor and the traditional internal combustion engine, it can be divided into strong mixing, medium mixing and weak mixing. The 48V BRS (Boost Recupera TIon system) system, as one of the hybrid hybrid electric vehicle (mHEV), will be the most cost-effective new energy vehicle technology solution in the next decade. Compared with the traditional internal combustion engine, the 48V BRS system mainly adds 48V Boost Recupera (BRM), 48V/12V DC power converter (PCU, Power Conversion Unit) and 48V lithium battery. , energy recovery, acceleration assistance, electric crawling and other functions. The traditional internal combustion engine vehicle is equipped with the first generation 48V system (the motor is integrated with the engine through the pulley). The fuel saving rate is 8~12%. The second generation 48V system (motor and gearbox integration) is expected to have a fuel saving rate of 12~19%. The origin of one, 48 volts 1) What is 48 volts? 48 volts refers to the system rated DC voltage, not always stable at 48V; according to the LV148 definition as shown below: The 48 volt battery voltage will vary with the SOC (remaining battery capacity), for example, the SOC is 10% to 100% at normal temperature, and the open circuit voltage is 32.5V to 49.8V; The power assist and energy recovery mode of the BRM motor will also cause the voltage of 48V to rise or fall. When the battery SOC is high, the battery is charged, and the required voltage is often higher than 50V. The DC voltage is not a straight line and is fluctuating. Regarding the allowable fluctuation of the DC voltage, the European regulations stipulate that the effective value of the fluctuation part (ie, the equivalent value after the mean value is removed) is less than 10% of the voltage average, which is regarded as DC. Voltage; 2) Why is 48V? 60V is a safe voltage. According to the above mentioned 10% margin, the maximum voltage allowed by the system is 54V. Consider the battery voltage change and energy recovery mode mentioned in 1), the voltage will rise, and then stay. A certain margin becomes 48V. The origin of the 48V name may also have some historical reasons. Second, 48 volt key components The typical connection diagram of the 48V BRS electrical network is as follows. In addition to BRM motors, DC converters, 48 ​​volt batteries and other major components, the 48V electrical load concept products on the market are also common, such as 48V electric supercharger, 48V electric heating catalyst, etc., the function expansion and promotion of 48V system Also has a positive effect. 1) Power recovery motor (BRM) The typical power recovery motor is shown in the figure below. It can be used to generate electricity, and it can also provide forward power for the vehicle. It can even start the engine quickly with a 48 volt battery pack. BRM generally uses claw pole motors, which replace traditional 14 volt generators.
True Wireless Stereo (TWS) Bluetooth Earphone GS23 features:
1 Listening to the song correct, support songs and call,
6 Compatible with Android, IOS, Microsoft and so on , 100% of the phone with Bluetooth
Detailed Specification
â— High, medium, low, three - frequency balance, sound shock
Sparation:≥90 dB
S/N:≥75 dB
Transmission distance:10 M
Playtime/Calling time:4 H
Charging time:1.5 H
earphone unit battery:35 mAh
Charging case battery:300 mAh
Bluetooth version:5.0V Wireless Bluetooth Headphones,Wireless Headphones Earbuds,Noise Cancelling Wireless Headphone,TWS True Wireless Stereo Headphone Headset Axiswell Technology Co., Ltd , https://www.medhealthycare.com
2 Remind call number, the last call back, all intelligent Chinese and English voice prompts, boot, pair, shut down the phone
power will be low voice prompts;
3 Power capacity will show on your for Iphone, you can see the power situation anytime, do not worry about the electricity ,make your life without worry;
4 One to two connections, can be connected to two mobile phones at the same time
5 Bluetooth Headset connected to the phone after the shutdown , and then open the bluetooth Headset will connect back to the phone automatically , more convenient;
â— Stereo audio transmission agreementA2DP .AVRCP .AVDTP .HFP .SPP .HSP .GATT
â— High-grade HiFi composite speaker unit
â— Both ears can be connected to one mobile phone at the same time, or to two mobile phones
â— Automatically matched and connected back to the connected cell phone without any operation
â— Support AI intelligent voice function, support IOS and some android mobile phone voice assistant function
â— Support to switch between English and Chinese
Speaker size: 10 mm